BIOLOGY 1 Marks Question

Which of the words given for the following statements are the related words (i) Prophase,(ii) Metaphase,(iii) Anaphase,(iv) Telophase.
(a) Nuclear membrane reappears.
(b) Chromosomes are the thickest and smallest.
(c) Chromosomes start coiling.
(d) The chromosome divides into two at the centromere.
(e) Pre-stage of cytokinesis.
(f) Each chromosome is made up of two chromatids/ half chromosomes.

Name the phase of nuclear division which is described by each of the following sentences:
(i) Disappearance of nuclear membrane.
(ii) Reappearance of nuclear membrane and nucleus.
(iii) Due to division of centromere and shortening of spindle fibres, chromatids reach towards opposite poles.
(iv) Chromosomes establish themselves on the equatorial plate of spindle and spindle fibres get attached to the centromere.

Give a specific scientific term for the following statements:
(a) The point at which two daughter half- chromosomes/daughter chromatids are joined together.
(b) Nuclear division.
(c) The time interval between two successive mitotic divisions.
(d) A process of cell division in which the number of chromosomes is reduced to half, which is followed by cytoplasmic division.
(e) That stage of the cell cycle in which mainly synthesis of proteins and RNA takes place.

The cell found in the apical cell keeps dividing throughout its life? So, what are they called?

Write the names of any two phases of interphase.

M phase begins with the division of what?

In which phase is DNA replication and chromosome doubling occurs?

Mitosis occurs only in which cells?

How many haploid cells are formed at the end of meiosis-II?

What is the state between two successive M states expressed?

Which division involves the healing of wounds in plants?

In which phase is the structure of the chromosome clearly visible?

What is phragmoplast? Explain its importance.

Approximately how much time is required in complete mitosis?

Define cell cycle.

Into which two stages is meiosis divided?

Define mitosis. In which cells does this occur?

If the nuclear membrane does not disappear during division, what is it called?

What is meant by bivalent and tetrad?

Define cell division.

What is the correct sequence of the cellular cycle?

Which division occurs during gamete production?

The number of Chiasmata depends on the length of?

What is syncytium? Give examples.

At what stage does pairing of homologous chromosomes occur?

Name the stage of the cell cycle during which the chromatin material doubles.

What is the division that occurs in reproductive cells called?

Crossing over process is controlled by which enzyme?

What is quiescent stage?

By what other name is the resting state known?

Which stage of meiotic division-1 is long?

Which are the two basic phases of the cell cycle?

How much time does it take for the cell cycle to complete in onion root cells?

Which phase is best for studying chromosomes?